This circuit was obtained from a 1980's QST magazine. The circuit can generate 1 to 15 MHz signals with 1 Vpp at 50 ohms load. Used transistors are still common today.
In the figure we have one of the many ways to program the counting of a 4017. The circuit uses...
We found this circuit in a French documentation from the 1980s. The circuit can be assembled with...
In the figure we have the suggestion of coupling an audio oscillator to monitor the CW...